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Article
Open AccessLarge enhancement of superconducting transition temperature of SrBi3 induced by Na substitution for Sr
The Matthias rule, which is an empirical correlation between the superconducting transition temperature (Tc) and the average number of valence electrons per atom (n) in alloys and intermetallic compounds, has bee...
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Article
Thermal, dielectric, and magnetic properties in multiferroic Cu2.85Zn0.15Mo2O9
We study the effects of Zn substitution on single crystals of the low-dimensional multiferroic material Cu3Mo2O9. We report the magnetic field-temperature phase diagram obtained from the temperature and the magne...
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Article
Oxidation of Ferrocene Derivatives in Desorption/Ionization on Porous Silicon
In matrix-assisted laser desorption/ionization (MALDI), the true molecular structures of some analytes are not represented by the observed ions due to a redox reaction. In earlier reports, electron transfer fr...
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Chapter and Conference Paper
Structural Differences of Superconducting and Non-Superconducting PrBa2Cu3Ox Crystals
Structural differences of PrBa2Cu3Ox crystals grown by TSFZ and flux methods were investigated using single crystal X-ray diffraction method, to make clear the origin of their different electrical properties. Obv...
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Chapter and Conference Paper
Magnetic Characteristics of the Superconducting TSFZ PrBa2Cu3Oy Crystal
We present the results of a detailed magnetic characteristics on superconducting PrBa2Cu3Ox (PrBCO) single crystals in applied magnetic fields up to 0.5 T. The PrBCO single crystals were grown by the travelling-s...
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Chapter and Conference Paper
Crystal Growth of PrBa2Cu3O7-y
Crystals of PrBa2Cu307-y have been grown by the travelling-solvent floating-zone (TSFZ) method and slow-cooling. The grown crystals were identified to be single crystal of PrBa2Cu307-y by Laue X-ray measurements,...
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Chapter and Conference Paper
Growth of large LaBa2Cu3O7-y and Bi2Sr2CaCu2O8-y crystals
Single crystal of LaBa2Cu3O7-y have been grown by the travelling-solvent floating-zone (TSFZ) method with low oxygen pressure atmosphere and twice-scanning technique. Single crystal of Bi2Sr2CaCu2O8-y have been g...
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Chapter and Conference Paper
Magnetic Relaxation and Second Peak of La2-xSrxCuO4 Single Crystals
A second peak in magnetization curve has been observed in La 2-xSrxCuO4 with x = 0.15 and 0.18, while not observed for x = 0. 115. We have evaluated flux pinning energy U eff from magnetic relaxat...
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Chapter and Conference Paper
Nanometer-Scale Surface Modification of Bi2Sr2CaCu2O8+δ Using Scanning Tunneling Microscopy
Nanometer-scale surface modification has been carried out on a cleaved Bi2Sr2CaCu2O8+δ single crystal in ultrahigh vacuum environment. A nanometer-scale hole (30 nm in width, 0.3 – 0.5, 1.5 or 3.0 nm in depth) is...
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Chapter and Conference Paper
Frequency Dependence and Anisotropy of ac Field Screening in the Mixed State of Bi2Sr2CaCu2O8
The screening signal in the mixed state of Bi2Sr2CaCu2O8 for an rf magnetic field, applied perpendicular to the two-dimensional (2D) superconducting plane, shows different behaviors from those at lower frequency....
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Chapter and Conference Paper
Crystal Growth of Pr2CuO4 System by the TSFZ Method
Single crystals of Pr2-xCexCuO4(x=0, 0.05, 0.1, 0.14) system were grown by the travelling-solvent floating-zone(TSFZ) method. Two-times scanning gave rising of the density in feed rod and stable growing process. ...
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Chapter and Conference Paper
Crystal Growth of La2CuO4, YBa2Cu3O7 and Bi2Sr2CaCu2O8 by the TSSG Method
We present our recent top-seeded solution growth experiments of La2CuO4(Ba,Sr), YBa2Cu3O7 and Bi2Sr2CaCu2O8.
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Chapter and Conference Paper
Effect of Ni Substitution on the Superconducting Properties in Bi2Sr2Ca1Cu2Oy
We have observed the effect of the substitution of Cu with Ni in Bi2Sr2Ca1Cu2−xNixOy (X=0, 0.02, 0.04) single crystals grown in air by Travelling Solvent Floating Zone (TSFZ) method. The temperature dependence of...
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Chapter and Conference Paper
Raman Scattering from Spin-Pair Excitations in Pr2−xCexCuO4−yNd2−xCexCuO4−y and Sm2−xCexCuO4−y
Antiferromagnetic excitations in single crystals of Pr2−xCexCuO4−y, Nd2xCexCuO4−y and Sm2−xCexCuO4−y were investigated as a function of Ce concentration using Raman scattering at room temperature. The introductio...
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Chapter and Conference Paper
Phase Diagram and Crystal Growth of Nd2CuO4 and Pr2CuO4 System
Single crystals of (NdCe)2CuO4 and (PrCe)2CuO4 were grown by the slow- cooling, travelling-solvent f1oating-zone (TSFZ) and top-seeded solution growth (TSSG) method. A crystallographic phase diagram of the Nd2O3-...
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Chapter and Conference Paper
Phase Diagram and Crystal Growth of RBa2Cu3O7-y System
Phase diagrams of R2O3(rare earth oxide)-BaO-CuO system have been investigated. The temperature versus concentration diagrams are given on the four binary systems ranging from RBa2Cu3O7-y to CuO, to BaCuO2 3CuO,·...
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Article
A magnetic 'glassy' state in La2CuO4–y
Since the discovery of high-Tc superconductivity in La2–xBaxCuO4–y, and related perovskite systems1–5, the magnetic properties of the parent compound La2CuO4–y have been of great interest, particularly with respe...
